Gb(3) and isoGb(3) are both biologically important oligosaccharides. A new efficient synthesis of Gb(3) and isoGb(3) trisaccharide analogues has been achieved by one-pot sequential glycosylation strategy starting from simple monosaccharide building blocks promoted by N-(phenylthio)-epsilon-caprolactam at room temperature. (c) 2006 Elsevier Ltd. All rights reserved.